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茶短须螨(Brevipalpus obovatus Donnadieu)是茶树上一种重要害螨。寄主范围广,能为害45科120多种植物。全年发生7代。以雌成螨在表土下根颈部越冬,但在我国南方茶区则无明显的滞育现象。螨体和卵多分布于茶树中、下部,以成叶或老叶的背面居多。雌、雄性比约2000∶1,以行孤雌生殖为主,也可行两性生殖,后代绝大多数为雌螨。雌成螨平均寿命为35—46天,长的可达6个月,平均产卵量35—40粒。在杭州地区,每年4月份平均气温上升至10—15℃时开始出蛰;24—30℃为适温范围,8月中旬—9月中旬,当旬平均气温高于24℃、降雨量小于40毫米、日照时数在60—100小时,20—30天后常会出现发生高峰,全年一般有两个高峰;平均气温低于17℃时,雌螨陆续进入滞育阶段。秋茶结束后(10月中旬)进行清园,并喷施0.5°Be 石硫合剂,可以有效地消灭越冬雌螨。发生高峰期之前(7—8月份)喷施棉油皂50倍液(暂订安全间隔期7—10天)、50%普特丹(三环锡)4000—6000倍或20%双甲眯1000倍液(暂订安全间隔期15天)对螨和卵均有较好的防治效果。
Brevipalpus obovatus Donnadieu is an important pest mite on the tea plant. A wide range of host, can harm 45 families more than 120 kinds of plants. Seven generations occur throughout the year. Female adult mites under the topsoil root and neck overwinter, but in our southern tea no obvious diapause. Mite body and eggs are distributed in the tea tree, the lower part of the back into the majority of leaves or old leaves. Female and male ratio of about 2000: 1, to line parthenogenesis, sexual reproduction is feasible, the vast majority of offspring of female mites. Female adult mites average life expectancy of 35-46 days, up to 6 months long, the average fecundity 35-40 tablets. In Hangzhou area, the average temperature in April each year rose to 10-15 ℃ began to sting; 24-30 ℃ for the temperature range, mid August - mid September, when the average temperature is above 24 ℃, the rainfall is less than 40 Mm, sunshine hours in the 60-100 hours, 20-30 days after the peak will occur often throughout the year there are two peaks; the average temperature below 17 ℃, the female mites one after another into the diapause stage. Autumn tea after the end of (mid-October) for the Park and spraying 0.5 ° Be limestone, can effectively eliminate overwintering female mites. Before the peak period (July-August) 50 times the cotton soap spray (tentative safety interval of 7-10 days), 50% of Putan (tricyclic tin) 4000-6000 times or 20% 1000 times the liquid (tentative security interval of 15 days) on mites and eggs have a better control effect.